[Issue] Item resolvers should be optional

[m2-assistant]

This issue is automatically created based on existing pull request: #30823: Item resolvers should be optional

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Item resolvers should be optional. If we remove configurable and grouped product, checkout is broken because this argument is mandatory. Only the grouper and configurable product add item resolver.

Preconditions (*)

1. Customer created
2. Simple Product created

Steps to reproduce (*)

1. Execute:

bin/magento module:disable Magento_GroupedImportExport
bin/magento module:disable Magento_GroupedCatalogInventory
bin/magento module:disable Magento_GroupedProductGraphQl
bin/magento module:disable Magento_MsrpGroupedProduct
bin/magento module:disable Magento_GroupedProduct
bin/magento module:disable Magento_CatalogRuleConfigurable
bin/magento module:disable Magento_MsrpConfigurableProduct
bin/magento module:disable Magento_NewRelicReporting
bin/magento module:disable Magento_ConfigurableProductGraphQl
bin/magento module:disable Magento_ConfigurableProductSales
bin/magento module:disable Magento_ConfigurableImportExport
bin/magento module:disable Magento_SwatchesGraphQl
bin/magento module:disable Magento_Swatches
bin/magento module:disable Magento_ConfigurableProduct
bin/magento setup:upgrade

2. Login on storefront.
3. Add Simple Product to cart.
4. Go to Checkout.
5. Create an Order.

Expected result (*)

1. Product added to Cart.
2. Order Created.

Actual result (*)

1. Error on adding Product.
2. Error on Checkout page.

[magento-engcom-team]

✅ Confirmed by @engcom-Oscar
Thank you for verifying the issue. Based on the provided information internal tickets MC-41818 were created

Issue Available: @engcom-Oscar, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.